höjdmodellens
A höjdmodellens, or digital elevation model (DEM), is a digital representation of the terrain's surface, typically showing elevation. It is a fundamental data product in geographic information systems (GIS) and remote sensing. DEMs are created using various methods, including photogrammetry from aerial photographs, radar interferometry, and digital capture from existing maps.
The primary function of a DEM is to provide elevation data for a specific geographic area. This
DEMs can exist in different forms. A Digital Terrain Model (DTM) represents the bare earth surface, excluding